Red flag: An obscure financial stat is shaking global confidence in Trump

Key Points:

• The 30-year Treasury bond yield reached 5.27% on July 31, 2026, marking its highest level since 2007 and signaling investor concerns about U.S. debt sustainability, according to the Peter G. Peterson Foundation.
• Rising bond yields increase borrowing costs due to a cyclical relationship between debt, interest rates, and interest expenses, reflecting a return to pre-Great Recession economic conditions after years of unusually low borrowing costs.
• The report attributes current economic pressures to factors including the Iran War, tariff policies, persistent inflation, and large fiscal deficits, with two of these factors linked directly to policies under President Donald Trump.
• U.S. net interest costs are projected to exceed $16 trillion over the next decade, emphasizing the need for policymakers to address structural deficits rather than attempting to control bond prices through buybacks.
• Economist Robert J. Shapiro warns that the ballooning deficits under Trump, combined with rising inflation and comparatively low tax burdens, have triggered bond market reactions that signal the current fiscal path is unsustainable.